diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..e0ef784
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,16 @@
+node_modules
+.next
+.git
+.gitignore
+.env
+.env.*
+!.env.example
+npm-debug.log*
+README.md
+AGENTS.md
+CLAUDE.md
+Dockerfile
+docker-compose.yml
+.dockerignore
+src/generated
+*.tsbuildinfo
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..8164e42
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,76 @@
+# syntax=docker/dockerfile:1
+
+# =============================================================================
+# QR-Code-Generator — Mehrstufiger Build
+# 1. deps      — Abhängigkeiten installieren
+# 2. builder   — Prisma Client erzeugen und Next.js standalone bauen
+# 3. prismacli — Prisma-CLI samt Abhängigkeiten für die Start-Migration
+# 4. runner    — schlankes Laufzeit-Image
+# =============================================================================
+
+FROM node:24-alpine AS base
+# openssl wird von den Prisma-Engines benötigt, libc6-compat von einigen
+# vorkompilierten Node-Modulen.
+RUN apk add --no-cache libc6-compat openssl
+WORKDIR /app
+ENV NEXT_TELEMETRY_DISABLED=1
+
+
+# --- 1. Abhängigkeiten -------------------------------------------------------
+FROM base AS deps
+COPY package.json package-lock.json ./
+# npm 11 blockiert Installationsskripte standardmäßig. Die Pakete, die welche
+# ausführen dürfen, stehen im Feld "allowScripts" der package.json — Prisma
+# lädt darüber seine Engine-Binaries.
+RUN npm ci
+
+
+# --- 2. Build ----------------------------------------------------------------
+FROM base AS builder
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN node ./node_modules/prisma/build/index.js generate
+RUN npm run build
+
+
+# --- 3. Prisma-CLI -----------------------------------------------------------
+# Der Container wendet beim Start selbst die Migrationen an und braucht dafür
+# die CLI. Sie hat mehr Abhängigkeiten als nur @prisma/* — deshalb wird ihre
+# vollständige Abhängigkeitshülle hier separat und ohne den Rest des Projekts
+# installiert.
+FROM base AS prismacli
+WORKDIR /prisma-cli
+COPY package.json ./
+RUN PRISMA_VERSION="$(node -p "require('./package.json').devDependencies.prisma")" \
+ && printf '%s' '{"name":"prisma-cli","private":true,"allowScripts":{"prisma":true,"@prisma/engines":true}}' > package.json \
+ && npm install --omit=dev --no-package-lock "prisma@${PRISMA_VERSION}"
+
+
+# --- 4. Laufzeit -------------------------------------------------------------
+FROM base AS runner
+ENV NODE_ENV=production \
+    PORT=3000 \
+    HOSTNAME=0.0.0.0
+
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+# Migrationen, Prisma-Konfiguration und die CLI. Letztere ergänzt die
+# node_modules des standalone-Builds, damit prisma.config.js ihre Module
+# auflösen kann.
+COPY --from=builder /app/prisma ./prisma
+COPY --from=builder /app/prisma.config.js ./prisma.config.js
+COPY --from=prismacli /prisma-cli/node_modules ./node_modules
+
+COPY docker/entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+USER nextjs
+EXPOSE 3000
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+CMD ["node", "server.js"]
diff --git a/README.md b/README.md
index e215bc4..03f74f5 100644
--- a/README.md
+++ b/README.md
@@ -1,36 +1,332 @@
-This is a [Next.js](https://nextjs.org) project bootstrapped with [`create-next-app`](https://nextjs.org/docs/app/api-reference/cli/create-next-app).
+# QR-Code-Generator
 
-## Getting Started
+Eine Webanwendung zum Erzeugen von QR-Codes — als Docker-Compose-Stack aus
+zwei Containern: der Next.js-Anwendung und einer PostgreSQL-Datenbank.
 
-First, run the development server:
+**Version 1** unterstützt den QR-Typ **Website/URL**, statisch wie dynamisch.
+Die übrigen 14 Typen sind bereits in der Oberfläche sichtbar und für Version 2
+vorbereitet.
+
+---
+
+## Inhalt
+
+- [Schnellstart](#schnellstart)
+- [Konfiguration](#konfiguration)
+- [Bedienung](#bedienung)
+- [Technischer Aufbau](#technischer-aufbau)
+- [Entwicklung ohne Docker](#entwicklung-ohne-docker)
+- [API](#api)
+- [Ausblick Version 2](#ausblick-version-2)
+
+---
+
+## Schnellstart
+
+Voraussetzung: Docker mit Docker Compose.
 
 ```bash
-npm run dev
-# or
-yarn dev
-# or
-pnpm dev
-# or
-bun dev
+cp .env.example .env      # anschließend POSTGRES_PASSWORD und BASE_URL anpassen
+docker compose up -d --build
 ```
 
-Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+Danach ist die Anwendung unter <http://localhost:3000> erreichbar. Die
+Datenbankmigrationen laufen beim Start des App-Containers automatisch — es
+sind keine weiteren Schritte nötig.
 
-You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+Nützliche Befehle:
 
-This project uses [`next/font`](https://nextjs.org/docs/app/building-your-application/optimizing/fonts) to automatically optimize and load [Geist](https://vercel.com/font), a new font family for Vercel.
+```bash
+docker compose logs -f app     # Protokoll der Anwendung
+docker compose ps              # Status beider Container
+docker compose down            # Stack stoppen (Daten bleiben erhalten)
+docker compose down -v         # Stack stoppen und Datenbank löschen
+```
 
-## Learn More
+---
 
-To learn more about Next.js, take a look at the following resources:
+## Konfiguration
 
-- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
-- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+Alle Einstellungen stehen in der `.env` im Projektverzeichnis (Vorlage:
+`.env.example`).
 
-You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js) - your feedback and contributions are welcome!
+| Variable            | Bedeutung                                                     | Standard                 |
+| ------------------- | ------------------------------------------------------------- | ------------------------ |
+| `BASE_URL`          | Öffentliche Adresse der App — landet in dynamischen QR-Codes    | `http://localhost:3000`  |
+| `APP_PORT`          | Host-Port, auf dem die App veröffentlicht wird                  | `3000`                   |
+| `DATABASE_URL`      | Verbindungsstring der App zur Datenbank                         | —                        |
+| `POSTGRES_USER`     | Datenbankbenutzer                                               | `qrcode`                 |
+| `POSTGRES_PASSWORD` | Datenbankpasswort (**muss gesetzt sein**)                       | —                        |
+| `POSTGRES_DB`       | Name der Datenbank                                              | `qrcode`                 |
 
-## Deploy on Vercel
+### Wichtig: `BASE_URL` richtig setzen
 
-The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+Ein dynamischer QR-Code enthält nicht das eigentliche Ziel, sondern die
+Kurz-URL `{BASE_URL}/r/{slug}`. Diese Adresse muss von den Geräten erreichbar
+sein, die den Code später scannen.
 
-Check out our [Next.js deployment documentation](https://nextjs.org/docs/app/building-your-application/deploying) for more details.
+- Nur am selben Rechner testen → `http://localhost:3000` genügt.
+- Im LAN mit dem Handy scannen → die LAN-Adresse des Servers eintragen, z. B.
+  `http://192.168.1.50:3000`.
+
+Wird `BASE_URL` nachträglich geändert, zeigen bereits **gedruckte** dynamische
+Codes weiterhin auf die alte Adresse. Am besten also vor dem ersten
+produktiven Code festlegen.
+
+Nach einer Änderung an der `.env`:
+
+```bash
+docker compose up -d
+```
+
+Ändern sich `POSTGRES_*`-Werte, muss `DATABASE_URL` entsprechend mitgezogen
+werden — der Hostname darin bleibt `db` (der Servicename aus
+`docker-compose.yml`).
+
+---
+
+## Bedienung
+
+### 1. Typ wählen
+
+Die Startseite zeigt unter „Was möchtest du erstellen?“ ein Kachel-Grid aller
+15 QR-Typen. In Version 1 ist **Website** aktiv (Badge „Beliebt“); die übrigen
+Kacheln sind sichtbar, aber deaktiviert (Badge „Bald verfügbar“).
+
+### 2. Statisch oder dynamisch
+
+|                        | Statisch                                     | Dynamisch                                            |
+| ---------------------- | -------------------------------------------- | ---------------------------------------------------- |
+| Im Code kodiert        | die Ziel-URL selbst                          | die Kurz-URL `{BASE_URL}/r/{slug}`                    |
+| Ziel später änderbar   | nein                                         | ja, jederzeit                                         |
+| Braucht diesen Server  | nein                                         | ja — er leitet weiter                                 |
+| Scans werden gezählt   | nein                                         | ja                                                    |
+| Wird gespeichert       | nein                                         | ja, in PostgreSQL                                     |
+
+Ein dynamischer Code muss einmal **gespeichert** werden, denn erst dabei
+entsteht seine Kurz-URL. Bis dahin zeigt die Vorschau einen Platzhalter und
+der Download ist gesperrt — so kann kein Code entstehen, der ins Leere führt.
+
+### 3. Gestalten
+
+- **Farben**: Vorder- und Hintergrund per Farbwähler oder als Hex-Wert.
+  Fünf Voreinstellungen und ein Knopf zum Tauschen der Farben stehen bereit.
+- **Kontrastwarnung**: Die Anwendung berechnet das Kontrastverhältnis und
+  warnt bei schlecht scanbaren Kombinationen — ebenso bei hellem Vordergrund
+  auf dunklem Grund, den viele Scanner-Apps nicht erkennen.
+- **Größe**: 256 bis 2048 px (gilt für das PNG; das SVG skaliert verlustfrei).
+- **Fehlerkorrektur**: L, M (Standard), Q oder H. Höhere Level machen den Code
+  robuster gegen Beschädigung, aber auch dichter.
+- **Rand**: Breite der Ruhezone in Modulen. Weniger als 4 kann das Scannen
+  erschweren.
+
+Die Vorschau wird bei jeder Änderung serverseitig neu erzeugt — sie zeigt also
+exakt das, was auch heruntergeladen wird.
+
+### 4. Herunterladen
+
+**PNG** für Druck und Office-Dokumente, **SVG** für verlustfreie Skalierung
+(Plakate, Schilder, Druckvorstufe).
+
+### 5. Meine Codes
+
+Unter „Meine Codes“ stehen alle dynamischen Codes mit Vorschaubild,
+Kurz-URL, aktuellem Ziel, Scan-Anzahl, Erstellungsdatum und letztem Scan.
+Dort lässt sich
+
+- das **Ziel ändern** — die Kurz-URL und damit der gedruckte Code bleiben
+  gültig,
+- der Code **löschen** (mit Bestätigungsdialog),
+- das Bild erneut als PNG oder SVG **herunterladen**.
+
+Statische Codes erscheinen hier nicht, weil sie nicht gespeichert werden.
+
+> Version 1 ist für den Einzelplatz-/LAN-Betrieb gedacht und hat **keine
+> Benutzerverwaltung**. Wer die Anwendung erreicht, sieht und ändert alle
+> Codes. Die App gehört daher nicht ungeschützt ins offene Internet.
+
+---
+
+## Technischer Aufbau
+
+### Stack
+
+| Baustein     | Verwendet                                              |
+| ------------ | ------------------------------------------------------- |
+| Framework    | Next.js 16 (App Router, TypeScript), Frontend + API     |
+| Oberfläche   | React 19, Tailwind CSS 4                                |
+| Datenbank    | PostgreSQL 18                                           |
+| ORM          | Prisma 7 mit `@prisma/adapter-pg`                       |
+| QR-Erzeugung | `qrcode`, serverseitig, Ausgabe als PNG und SVG         |
+| Validierung  | Zod 4, im Browser und noch einmal auf dem Server        |
+
+Der Stack läuft ohne Reverse Proxy: Der App-Container wird direkt per
+Port-Mapping veröffentlicht.
+
+### Verzeichnisse
+
+```
+prisma/
+  schema.prisma            Datenmodell (Modell QrCode)
+  migrations/              Versionierte Migrationen
+docker/
+  entrypoint.sh            Migration + Serverstart im Container
+src/
+  app/
+    page.tsx               Startseite mit dem Kachel-Grid
+    erstellen/[type]/      Generator je QR-Typ
+    meine-codes/           Übersicht der dynamischen Codes
+    r/[slug]/route.ts      Weiterleitung dynamischer Codes (302)
+    api/
+      qr/preview/          Live-Vorschau (SVG als Data-URL)
+      qr/download/         Download als PNG oder SVG
+      codes/               Anlegen und Auflisten dynamischer Codes
+      codes/[id]/          Ändern und Löschen
+      codes/[id]/qr/       Bild eines gespeicherten Codes
+  components/
+    qr-forms/              Formulare je QR-Typ + deren Registry
+    qr-generator.tsx       Generator-Oberfläche
+    codes-list.tsx         „Meine Codes“
+    design-panel.tsx       Farben, Größe, Fehlerkorrektur, Rand
+  lib/
+    qr/
+      type-module.ts       Vertrag eines QR-Typs (defineQrType)
+      registry.ts          Registry aller 15 Typen
+      types/website.ts     Der einzige aktive Typ in V1
+      design.ts            Gestaltungsoptionen + Zod-Schema
+      contrast.ts          Kontrastbewertung
+      render.ts            PNG-/SVG-Erzeugung
+      request.ts           Anfrage-Schema und Auflösung des Code-Inhalts
+    db.ts                  Prisma-Client
+    env.ts                 Laufzeit-Konfiguration
+```
+
+### Datenmodell
+
+Nur dynamische Codes werden gespeichert. Das Modell `QrCode` hält neben Slug,
+Zähler und Gestaltung ein generisches `data`-Feld (JSONB) sowie den Typ — so
+brauchen die Typen aus Version 2 **keine** Schemaänderung.
+
+### Wie ein QR-Typ aufgebaut ist
+
+Jeder Typ ist ein Modul, das über `defineQrType` erzeugt wird und vier Dinge
+beisteuert: Metadaten (Titel, Beschreibung, Icon), ein Zod-Schema, die
+Kodierung des Inhalts und eine Kurzfassung für Listen.
+
+```ts
+export const websiteType = defineQrType({
+  id: "website",
+  title: "Website",
+  description: "Verlinke eine beliebige Webadresse.",
+  icon: "globe",
+  active: true,
+  supportsDynamic: true,
+  schema: websiteDataSchema,
+  defaultData: { url: "" },
+  encode: (data) => data.url,
+  summary: (data) => describe(data.url),
+});
+```
+
+Innerhalb des Moduls arbeitet man mit dem echten, aus dem Zod-Schema
+abgeleiteten Datentyp; nach außen zeigt die Registry eine einheitliche
+Schnittstelle. Deshalb kennen Vorschau, Download, Speicherung und
+Weiterleitung keinen einzigen typspezifischen Sonderfall.
+
+### Warum 302 und kein 301?
+
+Die Weiterleitung unter `/r/{slug}` antwortet mit **302 (temporär)** und
+`Cache-Control: no-store`. Ein permanenter Redirect würde in Browsern hängen
+bleiben: Zieländerungen kämen nicht an und der Scan-Zähler bliebe stehen.
+
+---
+
+## Entwicklung ohne Docker
+
+Voraussetzung: Node.js 20.9+ und eine erreichbare PostgreSQL-Instanz.
+
+```bash
+npm install
+
+# Datenbank z. B. als Einzelcontainer starten
+docker run -d --name qr-db -p 5432:5432 \
+  -e POSTGRES_USER=qrcode -e POSTGRES_PASSWORD=devpass -e POSTGRES_DB=qrcode \
+  postgres:18-alpine
+
+# .env anlegen und DATABASE_URL auf localhost zeigen lassen:
+#   DATABASE_URL=postgresql://qrcode:devpass@localhost:5432/qrcode?schema=public
+
+npm run db:migrate        # Migrationen anwenden und Prisma Client erzeugen
+npm run dev               # http://localhost:3000
+```
+
+Weitere Skripte:
+
+```bash
+npm run build             # Produktionsbuild
+npm run typecheck         # TypeScript prüfen
+npm run lint              # ESLint
+npm run db:studio         # Prisma Studio (Datenbank ansehen)
+```
+
+> **Hinweis zu npm 11:** Installationsskripte sind standardmäßig blockiert.
+> Die Pakete, die welche ausführen dürfen (Prisma lädt darüber seine
+> Engine-Binaries), stehen im Feld `allowScripts` der `package.json`.
+
+---
+
+## API
+
+Alle Endpunkte antworten im Fehlerfall mit `{ "error": "…" }` und einer
+deutschen Meldung.
+
+| Methode  | Pfad                    | Zweck                                          |
+| -------- | ----------------------- | ---------------------------------------------- |
+| `POST`   | `/api/qr/preview`       | Vorschau als SVG-Data-URL                       |
+| `POST`   | `/api/qr/download`      | PNG- oder SVG-Datei                             |
+| `GET`    | `/api/codes`            | Alle dynamischen Codes                          |
+| `POST`   | `/api/codes`            | Dynamischen Code anlegen                        |
+| `GET`    | `/api/codes/{id}`       | Einzelnen Code lesen                            |
+| `PATCH`  | `/api/codes/{id}`       | Ziel, Name oder Gestaltung ändern               |
+| `DELETE` | `/api/codes/{id}`       | Code löschen                                    |
+| `GET`    | `/api/codes/{id}/qr`    | Bild des Codes (`?format=png\|svg&download=1`)  |
+| `GET`    | `/r/{slug}`             | Weiterleitung, erhöht den Scan-Zähler           |
+
+Beispiel:
+
+```bash
+curl -X POST http://localhost:3000/api/codes \
+  -H 'Content-Type: application/json' \
+  -d '{
+        "type": "website",
+        "data": { "url": "https://example.com" },
+        "design": { "fgColor": "#0F172A", "bgColor": "#FFFFFF",
+                    "size": 512, "ecLevel": "M", "margin": 4 },
+        "label": "Plakat Eingang"
+      }'
+```
+
+---
+
+## Ausblick Version 2
+
+Geplant sind die übrigen 14 Typen: vCard, App-Link, Mehrere Links, Social
+Media, WhatsApp, PDF, Bild, Video, E-Mail, SMS, Standort, Zahlung, WLAN und
+Feedback.
+
+Die Architektur ist darauf ausgelegt — ein neuer Typ besteht aus:
+
+1. **einem Modul** in `src/lib/qr/types/` (Zod-Schema, Kodierung, Kurzfassung),
+2. **einer Formular-Komponente** in `src/components/qr-forms/`,
+3. **je einem Eintrag** in `src/lib/qr/registry.ts` (ersetzt dort den
+   `defineComingSoonType`-Platzhalter) und in
+   `src/components/qr-forms/index.ts`.
+
+Am bestehenden Code aus Version 1 ist dafür nichts zu ändern: Vorschau,
+Download, Gestaltung, Speicherung dynamischer Codes und die Weiterleitung
+arbeiten für alle Typen gleich.
+
+Typen, die statt einer Weiterleitung eine eigene Landingpage brauchen (etwa
+„Mehrere Links“ oder „Feedback“), setzen dafür `redirectTarget` auf eine
+interne Adresse — auch dafür ist keine Änderung am Datenmodell nötig, weil
+`data` als JSONB gespeichert wird.
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..f9383ee
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,39 @@
+services:
+  db:
+    image: postgres:18-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-qrcode}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?POSTGRES_PASSWORD fehlt — bitte .env aus .env.example anlegen}
+      POSTGRES_DB: ${POSTGRES_DB:-qrcode}
+    volumes:
+      # Ab PostgreSQL 18 liegt das Datenverzeichnis in einem Unterordner mit
+      # Versionsnummer — der Mountpunkt ist deshalb /var/lib/postgresql und
+      # nicht mehr /var/lib/postgresql/data.
+      - db-data:/var/lib/postgresql
+    healthcheck:
+      # Die App startet erst, wenn die Datenbank wirklich Anfragen annimmt.
+      test:
+        ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-qrcode} -d ${POSTGRES_DB:-qrcode}"]
+      interval: 5s
+      timeout: 5s
+      retries: 12
+      start_period: 10s
+
+  app:
+    build:
+      context: .
+    restart: unless-stopped
+    depends_on:
+      db:
+        condition: service_healthy
+    environment:
+      # Öffentliche Adresse der App — landet in jedem dynamischen QR-Code.
+      BASE_URL: ${BASE_URL:-http://localhost:3000}
+      DATABASE_URL: ${DATABASE_URL}
+    ports:
+      # Direktes Port-Mapping, bewusst ohne Reverse Proxy.
+      - "${APP_PORT:-3000}:3000"
+
+volumes:
+  db-data:
diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
new file mode 100644
index 0000000..6452bf1
--- /dev/null
+++ b/docker/entrypoint.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+# Startskript des App-Containers: erst Migrationen, dann der Server.
+set -e
+
+echo "→ Datenbankmigrationen werden angewendet …"
+node /app/node_modules/prisma/build/index.js migrate deploy
+
+echo "→ Anwendung wird gestartet …"
+exec "$@"
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 05e726d..d7506a0 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -12,7 +12,15 @@ const eslintConfig = defineConfig([
     "out/**",
     "build/**",
     "next-env.d.ts",
+    // Von Prisma erzeugter Client.
+    "src/generated/**",
   ]),
+  {
+    // Die Prisma-Konfiguration ist bewusst CommonJS: so lässt sie sich im
+    // Laufzeit-Image ohne TypeScript-Loader einlesen.
+    files: ["prisma.config.js"],
+    rules: { "@typescript-eslint/no-require-imports": "off" },
+  },
 ]);
 
 export default eslintConfig;
diff --git a/package-lock.json b/package-lock.json
index e314074..4ad8623 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,18 +1,17 @@
 {
   "name": "qrcode-generator",
-  "version": "0.1.0",
+  "version": "1.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "qrcode-generator",
-      "version": "0.1.0",
+      "version": "1.0.0",
       "dependencies": {
         "@prisma/adapter-pg": "^7.9.1",
         "@prisma/client": "^7.9.1",
         "next": "16.3.0",
-        "pg": "^8.23.0",
-        "prisma": "^7.9.1",
+        "pg": "^8.16.3",
         "qrcode": "^1.5.4",
         "react": "19.2.8",
         "react-dom": "19.2.8",
@@ -22,13 +21,14 @@
       "devDependencies": {
         "@tailwindcss/postcss": "^4",
         "@types/node": "^20",
-        "@types/pg": "^8.21.0",
+        "@types/pg": "^8.15.6",
         "@types/qrcode": "^1.5.6",
         "@types/react": "^19",
         "@types/react-dom": "^19",
-        "dotenv": "^17.4.2",
+        "dotenv": "^17.2.4",
         "eslint": "^9",
         "eslint-config-next": "16.3.0",
+        "prisma": "^7.9.1",
         "tailwindcss": "^4",
         "typescript": "^5"
       }
@@ -290,12 +290,14 @@
       "version": "0.4.3",
       "resolved": "https://registry.npmjs.org/@electric-sql/pglite/-/pglite-0.4.3.tgz",
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@@ -6719,6 +6822,7 @@
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@@ -6841,12 +6946,14 @@
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+      "devOptional": true,
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+      "devOptional": true,
       "license": "MIT"
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@@ -6970,6 +7077,7 @@
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+      "devOptional": true,
       "license": "MIT",
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@@ -7029,6 +7137,7 @@
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+      "devOptional": true,
       "license": "Unlicense",
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@@ -7091,6 +7200,7 @@
       "version": "7.9.1",
       "resolved": "https://registry.npmjs.org/prisma/-/prisma-7.9.1.tgz",
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+      "devOptional": true,
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       "license": "Apache-2.0",
       "dependencies": {
@@ -7136,6 +7246,7 @@
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+      "devOptional": true,
       "license": "MIT",
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@@ -7147,6 +7258,7 @@
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       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
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+      "devOptional": true,
       "license": "ISC"
     },
     "node_modules/punycode": {
@@ -7163,6 +7275,7 @@
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-6.1.0.tgz",
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+      "devOptional": true,
       "funding": [
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@@ -7217,6 +7330,7 @@
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+      "devOptional": true,
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@@ -7255,6 +7369,7 @@
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+      "devOptional": true,
       "license": "MIT",
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@@ -7312,6 +7427,7 @@
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+      "devOptional": true,
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/remeda"
@@ -7330,6 +7446,7 @@
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       "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
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+      "devOptional": true,
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@@ -7389,6 +7506,7 @@
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+      "devOptional": true,
       "license": "MIT",
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@@ -7398,6 +7516,7 @@
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+      "devOptional": true,
       "license": "MIT",
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@@ -7418,6 +7537,7 @@
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+      "devOptional": true,
       "license": "Unlicense"
     },
     "node_modules/run-parallel": {
@@ -7503,6 +7623,7 @@
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/safe-regex2/-/safe-regex2-5.1.1.tgz",
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+      "devOptional": true,
       "funding": [
         {
           "type": "github",
@@ -7525,6 +7646,7 @@
       "version": "2.1.2",
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+      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/scheduler": {
@@ -7546,7 +7668,8 @@
     "node_modules/seq-queue": {
       "version": "0.0.5",
       "resolved": "https://registry.npmjs.org/seq-queue/-/seq-queue-0.0.5.tgz",
-      "integrity": "sha512-hr3Wtp/GZIc/6DAGPDcV4/9WoZhjrkXsi5B/07QgX8tsdc6ilr7BFM6PM6rbdAX1kFSDYeZGLipIZZKyQP0O5Q=="
+      "integrity": "sha512-hr3Wtp/GZIc/6DAGPDcV4/9WoZhjrkXsi5B/07QgX8tsdc6ilr7BFM6PM6rbdAX1kFSDYeZGLipIZZKyQP0O5Q==",
+      "devOptional": true
     },
     "node_modules/server-only": {
       "version": "0.0.1",
@@ -7676,6 +7799,7 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
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+      "devOptional": true,
       "license": "MIT",
       "dependencies": {
         "shebang-regex": "^3.0.0"
@@ -7688,6 +7812,7 @@
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
       "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+      "devOptional": true,
       "license": "MIT",
       "engines": {
         "node": ">=8"
@@ -7773,6 +7898,7 @@
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-4.1.0.tgz",
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+      "devOptional": true,
       "license": "ISC",
       "engines": {
         "node": ">=14"
@@ -7803,6 +7929,7 @@
       "version": "2.3.3",
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+      "devOptional": true,
       "license": "MIT",
       "engines": {
         "node": ">= 0.6"
@@ -7819,6 +7946,7 @@
       "version": "3.10.0",
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+      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/stop-iteration-iterator": {
@@ -8417,6 +8545,7 @@
       "version": "1.4.2",
       "resolved": "https://registry.npmjs.org/valibot/-/valibot-1.4.2.tgz",
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+      "devOptional": true,
       "license": "MIT",
       "peerDependencies": {
         "typescript": ">=5"
@@ -8431,6 +8560,7 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "devOptional": true,
       "license": "ISC",
       "dependencies": {
         "isexe": "^2.0.0"
@@ -8687,6 +8817,7 @@
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/zeptomatch/-/zeptomatch-2.1.0.tgz",
       "integrity": "sha512-KiGErG2J0G82LSpniV0CtIzjlJ10E04j02VOudJsPyPwNZgGnRKQy7I1R7GMyg/QswnE4l7ohSGrQbQbjXPPDA==",
+      "devOptional": true,
       "license": "MIT",
       "dependencies": {
         "grammex": "^3.1.11",
diff --git a/package.json b/package.json
index ddfa187..e498a2c 100644
--- a/package.json
+++ b/package.json
@@ -1,19 +1,23 @@
 {
   "name": "qrcode-generator",
-  "version": "0.1.0",
+  "version": "1.0.0",
   "private": true,
   "scripts": {
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "typecheck": "tsc --noEmit",
+    "db:generate": "prisma generate",
+    "db:migrate": "prisma migrate dev",
+    "db:deploy": "prisma migrate deploy",
+    "db:studio": "prisma studio"
   },
   "dependencies": {
     "@prisma/adapter-pg": "^7.9.1",
     "@prisma/client": "^7.9.1",
     "next": "16.3.0",
-    "pg": "^8.23.0",
-    "prisma": "^7.9.1",
+    "pg": "^8.16.3",
     "qrcode": "^1.5.4",
     "react": "19.2.8",
     "react-dom": "19.2.8",
@@ -23,14 +27,20 @@
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
     "@types/node": "^20",
-    "@types/pg": "^8.21.0",
+    "@types/pg": "^8.15.6",
     "@types/qrcode": "^1.5.6",
     "@types/react": "^19",
     "@types/react-dom": "^19",
-    "dotenv": "^17.4.2",
+    "dotenv": "^17.2.4",
     "eslint": "^9",
     "eslint-config-next": "16.3.0",
+    "prisma": "^7.9.1",
     "tailwindcss": "^4",
     "typescript": "^5"
+  },
+  "allowScripts": {
+    "prisma": true,
+    "@prisma/engines": true,
+    "unrs-resolver": true
   }
 }
diff --git a/prisma.config.js b/prisma.config.js
new file mode 100644
index 0000000..4e366f0
--- /dev/null
+++ b/prisma.config.js
@@ -0,0 +1,26 @@
+// Prisma-Konfiguration (CommonJS, damit sie ohne TypeScript-Loader auch im
+// schlanken Laufzeit-Image des Containers gelesen werden kann).
+//
+// Prisma 7 liest Verbindungsdaten nicht mehr aus schema.prisma, sondern von
+// hier — die Anwendung selbst verbindet sich über den pg-Driver-Adapter in
+// src/lib/db.ts.
+
+// Im Container kommt DATABASE_URL aus der Umgebung; lokal ist .env bequemer.
+// dotenv ist nur eine Dev-Abhängigkeit und im Image bewusst nicht vorhanden.
+try {
+  require("dotenv/config");
+} catch {
+  // Kein dotenv vorhanden — die Umgebungsvariablen sind bereits gesetzt.
+}
+
+const { defineConfig } = require("prisma/config");
+
+module.exports = defineConfig({
+  schema: "prisma/schema.prisma",
+  migrations: {
+    path: "prisma/migrations",
+  },
+  datasource: {
+    url: process.env.DATABASE_URL,
+  },
+});
diff --git a/prisma.config.ts b/prisma.config.ts
deleted file mode 100644
index 831a20f..0000000
--- a/prisma.config.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-// This file was generated by Prisma, and assumes you have installed the following:
-// npm install --save-dev prisma dotenv
-import "dotenv/config";
-import { defineConfig } from "prisma/config";
-
-export default defineConfig({
-  schema: "prisma/schema.prisma",
-  migrations: {
-    path: "prisma/migrations",
-  },
-  datasource: {
-    url: process.env["DATABASE_URL"],
-  },
-});
diff --git a/src/app/api/codes/[id]/qr/route.ts b/src/app/api/codes/[id]/qr/route.ts
index ed44d50..e3806fa 100644
--- a/src/app/api/codes/[id]/qr/route.ts
+++ b/src/app/api/codes/[id]/qr/route.ts
@@ -55,9 +55,9 @@ export async function GET(
     };
 
     if (isDownload) {
-      const module = getQrType(code.type);
-      const name = module
-        ? downloadFilename(module, code.data, format)
+      const qrType = getQrType(code.type);
+      const name = qrType
+        ? downloadFilename(qrType, code.data, format)
         : `qr-${code.slug}.${format}`;
       headers["Content-Disposition"] = `attachment; filename="${name}"`;
     }
diff --git a/src/app/api/codes/[id]/route.ts b/src/app/api/codes/[id]/route.ts
index 0ce6566..50ce503 100644
--- a/src/app/api/codes/[id]/route.ts
+++ b/src/app/api/codes/[id]/route.ts
@@ -60,13 +60,13 @@ export async function PATCH(
     const update: Prisma.QrCodeUpdateInput = {};
 
     if (parsed.data.data !== undefined) {
-      const module = getActiveQrType(existing.type);
-      if (!module) {
+      const qrType = getActiveQrType(existing.type);
+      if (!qrType) {
         throw new QrRequestError(
           "Der Typ dieses Codes wird in dieser Version nicht unterstützt.",
         );
       }
-      const validated = module.validate(parsed.data.data);
+      const validated = qrType.validate(parsed.data.data);
       if (!validated.ok) {
         return jsonError(validated.message);
       }
diff --git a/src/app/api/codes/route.ts b/src/app/api/codes/route.ts
index ef682cd..a3d88ce 100644
--- a/src/app/api/codes/route.ts
+++ b/src/app/api/codes/route.ts
@@ -51,20 +51,20 @@ export async function POST(request: NextRequest): Promise<Response> {
     }
 
     const { type, design, label } = parsed.data;
-    const module = getActiveQrType(type);
-    if (!module) {
+    const qrType = getActiveQrType(type);
+    if (!qrType) {
       throw new QrRequestError(
         "Dieser QR-Typ ist in dieser Version noch nicht verfügbar.",
         404,
       );
     }
-    if (!module.supportsDynamic) {
+    if (!qrType.supportsDynamic) {
       throw new QrRequestError(
-        `Der QR-Typ „${module.title}" unterstützt keine dynamischen Codes.`,
+        `Der QR-Typ „${qrType.title}“ unterstützt keine dynamischen Codes.`,
       );
     }
 
-    const validated = module.validate(parsed.data.data);
+    const validated = qrType.validate(parsed.data.data);
     if (!validated.ok) {
       return jsonError(validated.message);
     }
@@ -75,7 +75,7 @@ export async function POST(request: NextRequest): Promise<Response> {
         const created = await prisma.qrCode.create({
           data: {
             slug: generateSlug(),
-            type: module.id,
+            type: qrType.id,
             label: label && label.length > 0 ? label : null,
             data: toJsonInput(validated.data),
             ...design,
diff --git a/src/app/api/qr/download/route.ts b/src/app/api/qr/download/route.ts
index e7f1095..b3c5bc4 100644
--- a/src/app/api/qr/download/route.ts
+++ b/src/app/api/qr/download/route.ts
@@ -31,7 +31,7 @@ export async function POST(request: NextRequest): Promise<Response> {
       );
     }
 
-    const { module, data, content } = resolveQrRequest(parsed.data);
+    const { qrType, data, content } = resolveQrRequest(parsed.data);
 
     const body =
       format === "png"
@@ -41,7 +41,7 @@ export async function POST(request: NextRequest): Promise<Response> {
     return new Response(body, {
       headers: {
         "Content-Type": CONTENT_TYPES[format],
-        "Content-Disposition": `attachment; filename="${downloadFilename(module, data, format)}"`,
+        "Content-Disposition": `attachment; filename="${downloadFilename(qrType, data, format)}"`,
         "Cache-Control": "no-store",
       },
     });
diff --git a/src/app/erstellen/[type]/page.tsx b/src/app/erstellen/[type]/page.tsx
index 713a0e0..d549b7c 100644
--- a/src/app/erstellen/[type]/page.tsx
+++ b/src/app/erstellen/[type]/page.tsx
@@ -15,15 +15,15 @@ export function generateStaticParams() {
 
 export async function generateMetadata({ params }: Props): Promise<Metadata> {
   const { type } = await params;
-  const module = getQrType(type);
-  return { title: module ? `${module.title}-QR-Code` : "QR-Code erstellen" };
+  const qrType = getQrType(type);
+  return { title: qrType ? `${qrType.title}-QR-Code` : "QR-Code erstellen" };
 }
 
 export default async function CreatePage({ params }: Props) {
   const { type } = await params;
-  const module = getQrType(type);
+  const qrType = getQrType(type);
 
-  if (!module) {
+  if (!qrType) {
     notFound();
   }
 
@@ -33,10 +33,10 @@ export default async function CreatePage({ params }: Props) {
     return (
       <div className="mx-auto max-w-2xl px-4 py-16 text-center sm:px-6">
         <span className="mx-auto flex size-14 items-center justify-center rounded-2xl bg-slate-100 text-slate-400">
-          <Icon name={module.icon} className="size-7" />
+          <Icon name={qrType.icon} className="size-7" />
         </span>
         <h1 className="mt-5 text-2xl font-bold text-slate-900">
-          „{module.title}“ ist bald verfügbar
+          „{qrType.title}“ ist bald verfügbar
         </h1>
         <p className="mt-2 text-slate-600">
           Dieser QR-Typ folgt in Version 2. In Version 1 steht der Typ „Website“
@@ -52,5 +52,5 @@ export default async function CreatePage({ params }: Props) {
     );
   }
 
-  return <QrGenerator typeId={module.id} />;
+  return <QrGenerator typeId={qrType.id} />;
 }
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index aeb58cf..8e2c8ad 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -49,7 +49,7 @@ export default function RootLayout({ children }: LayoutProps<"/">) {
 
         <footer className="border-t border-slate-200 bg-white">
           <div className="mx-auto max-w-6xl px-4 py-6 text-sm text-slate-500 sm:px-6">
-            QR-Code-Generator · Version 1 — QR-Typ „Website/URL"
+            QR-Code-Generator · Version 1 — QR-Typ „Website/URL“
           </div>
         </footer>
       </body>
diff --git a/src/app/page.tsx b/src/app/page.tsx
index 529e0e8..fef005c 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -73,7 +73,7 @@ export default function HomePage() {
               ) : (
                 <div
                   aria-disabled="true"
-                  title={`„${type.title}" folgt in Version 2`}
+                  title={`„${type.title}“ folgt in Version 2`}
                   className="flex h-full cursor-not-allowed items-start gap-4 rounded-2xl border border-dashed border-slate-200 bg-slate-50/60 p-4"
                 >
                   {tile}
@@ -85,7 +85,7 @@ export default function HomePage() {
       </ul>
 
       <p className="mt-8 text-sm text-slate-500">
-        In Version 1 ist der Typ „Website" verfügbar. Die übrigen Typen folgen in
+        In Version 1 ist der Typ „Website“ verfügbar. Die übrigen Typen folgen in
         Version 2.
       </p>
     </div>
diff --git a/src/app/r/[slug]/route.ts b/src/app/r/[slug]/route.ts
index 5098dd4..79d7bf3 100644
--- a/src/app/r/[slug]/route.ts
+++ b/src/app/r/[slug]/route.ts
@@ -52,14 +52,14 @@ export async function GET(
     );
   }
 
-  const module = getQrType(code.type);
-  if (!module) {
+  const qrType = getQrType(code.type);
+  if (!qrType) {
     return notFound("Der Typ dieses Codes wird nicht mehr unterstützt.");
   }
 
   let target: string;
   try {
-    target = module.redirectTarget(code.data);
+    target = qrType.redirectTarget(code.data);
   } catch {
     return notFound("Das Ziel dieses Codes ist nicht mehr gültig.");
   }
diff --git a/src/components/codes-list.tsx b/src/components/codes-list.tsx
index da281d4..f0a77d4 100644
--- a/src/components/codes-list.tsx
+++ b/src/components/codes-list.tsx
@@ -54,6 +54,9 @@ export function CodesList() {
   }, []);
 
   useEffect(() => {
+    // `load` setzt den Zustand erst nach dem await der Netzwerkantwort, also
+    // nie synchron während des Effekts — die Regel kann das nicht erkennen.
+    // eslint-disable-next-line react-hooks/set-state-in-effect
     void load();
   }, [load]);
 
diff --git a/src/components/qr-generator.tsx b/src/components/qr-generator.tsx
index 7f46d42..c1c35a1 100644
--- a/src/components/qr-generator.tsx
+++ b/src/components/qr-generator.tsx
@@ -43,10 +43,10 @@ function sameData(a: unknown, b: unknown): boolean {
 }
 
 export function QrGenerator({ typeId }: { typeId: QrTypeId }) {
-  const module = qrTypes[typeId];
+  const qrType = qrTypes[typeId];
   const Form = qrForms[typeId];
 
-  const [data, setData] = useState<QrFormData>(module.defaultData);
+  const [data, setData] = useState<QrFormData>(qrType.defaultData);
   const [design, setDesign] = useState<QrDesign>(defaultDesign);
   const [isDynamic, setIsDynamic] = useState(false);
   const [label, setLabel] = useState("");
@@ -62,14 +62,14 @@ export function QrGenerator({ typeId }: { typeId: QrTypeId }) {
   const [downloading, setDownloading] = useState<"png" | "svg" | null>(null);
   const [downloadError, setDownloadError] = useState<string | null>(null);
 
-  const validation = useMemo(() => module.validate(data), [module, data]);
+  const validation = useMemo(() => qrType.validate(data), [qrType, data]);
   const designValid = useMemo(
     () => designSchema.safeParse(design).success,
     [design],
   );
 
   // Fehler erst zeigen, wenn tatsächlich etwas eingegeben wurde.
-  const touched = !sameData(data, module.defaultData);
+  const touched = !sameData(data, qrType.defaultData);
   const dataError = !validation.ok && touched ? validation.message : null;
 
   const mode = isDynamic ? "dynamic" : "static";
@@ -87,18 +87,13 @@ export function QrGenerator({ typeId }: { typeId: QrTypeId }) {
   const requestId = useRef(0);
 
   useEffect(() => {
-    if (!ready) {
-      setPreview(null);
-      setPreviewError(null);
-      setPreviewLoading(false);
-      return;
-    }
+    if (!ready) return;
 
     const id = (requestId.current += 1);
     const controller = new AbortController();
-    setPreviewLoading(true);
 
     const timer = setTimeout(() => {
+      setPreviewLoading(true);
       apiJson<PreviewState>("/api/qr/preview", {
         method: "POST",
         json: requestBody,
@@ -129,6 +124,13 @@ export function QrGenerator({ typeId }: { typeId: QrTypeId }) {
     };
   }, [ready, requestBody]);
 
+  // Solange die Eingaben unvollständig sind, gibt es nichts anzuzeigen. Das
+  // wird abgeleitet statt im Effekt zurückgesetzt — so bleibt beim Tippen die
+  // zuletzt gültige Vorschau stehen, statt bei jedem Zeichen zu flackern.
+  const shownPreview = ready ? preview : null;
+  const shownPreviewError = ready ? previewError : null;
+  const shownPreviewLoading = ready && previewLoading;
+
   /* ------------------------------------------------------------ Download */
 
   const downloadDisabledReason =
@@ -224,13 +226,13 @@ export function QrGenerator({ typeId }: { typeId: QrTypeId }) {
 
       <div className="mb-7 flex flex-wrap items-center gap-3">
         <span className="flex size-11 items-center justify-center rounded-xl bg-indigo-50 text-indigo-600">
-          <Icon name={module.icon} className="size-6" />
+          <Icon name={qrType.icon} className="size-6" />
         </span>
         <div>
           <h1 className="text-2xl font-bold tracking-tight text-slate-900">
-            {module.title}-QR-Code erstellen
+            {qrType.title}-QR-Code erstellen
           </h1>
-          <p className="text-sm text-slate-600">{module.description}</p>
+          <p className="text-sm text-slate-600">{qrType.description}</p>
         </div>
       </div>
 
@@ -279,7 +281,7 @@ export function QrGenerator({ typeId }: { typeId: QrTypeId }) {
               <button
                 type="button"
                 aria-pressed={isDynamic}
-                disabled={!module.supportsDynamic}
+                disabled={!qrType.supportsDynamic}
                 onClick={() => setIsDynamic(true)}
                 className={cx(
                   "rounded-xl border p-4 text-left transition-colors disabled:cursor-not-allowed disabled:opacity-50",
@@ -353,7 +355,7 @@ export function QrGenerator({ typeId }: { typeId: QrTypeId }) {
                         href="/meine-codes"
                         className="inline-flex items-center gap-1.5 rounded-lg text-sm font-medium text-indigo-600 hover:text-indigo-700"
                       >
-                        Zu „Meine Codes"
+                        Zu „Meine Codes“
                         <Icon name="external" className="size-3.5" />
                       </Link>
                     </div>
@@ -401,11 +403,11 @@ export function QrGenerator({ typeId }: { typeId: QrTypeId }) {
           <Card>
             <CardTitle>Vorschau</CardTitle>
             <QrPreview
-              dataUrl={preview?.dataUrl ?? null}
-              content={preview?.content ?? null}
+              dataUrl={shownPreview?.dataUrl ?? null}
+              content={shownPreview?.content ?? null}
               size={design.size}
-              error={previewError ?? downloadError}
-              loading={previewLoading}
+              error={shownPreviewError ?? downloadError}
+              loading={shownPreviewLoading}
               downloadDisabledReason={downloadDisabledReason}
               onDownload={handleDownload}
               downloading={downloading}
diff --git a/src/lib/codes.ts b/src/lib/codes.ts
index 671578f..d3973c5 100644
--- a/src/lib/codes.ts
+++ b/src/lib/codes.ts
@@ -28,14 +28,14 @@ function asRecord(value: unknown): Record<string, unknown> {
 
 export function toQrCodeDto(code: QrCode): QrCodeDto {
   const data = asRecord(code.data);
-  const module = getQrType(code.type);
+  const qrType = getQrType(code.type);
 
   let target = "";
   let summary = "";
-  if (module) {
+  if (qrType) {
     try {
-      target = module.redirectTarget(data);
-      summary = module.summary(data);
+      target = qrType.redirectTarget(data);
+      summary = qrType.summary(data);
     } catch {
       // Datensatz passt nicht mehr zum Typ-Schema (z. B. nach einem
       // Schema-Wechsel). Die Liste soll trotzdem anzeigbar bleiben.
diff --git a/src/lib/db.ts b/src/lib/db.ts
index 99c1e72..9836556 100644
--- a/src/lib/db.ts
+++ b/src/lib/db.ts
@@ -5,20 +5,40 @@ import { PrismaPg } from "@prisma/adapter-pg";
 import { PrismaClient } from "@/generated/prisma/client";
 import { getDatabaseUrl } from "@/lib/env";
 
+type Client = InstanceType<typeof PrismaClient>;
+
 // Im Entwicklungsmodus wird das Modul bei jedem Hot-Reload neu ausgewertet.
 // Ohne diesen Cache entstünde pro Reload ein neuer Verbindungspool.
-const globalForPrisma = globalThis as unknown as {
-  prisma?: ReturnType<typeof createPrismaClient>;
-};
+const globalForPrisma = globalThis as unknown as { prisma?: Client };
 
-function createPrismaClient() {
-  return new PrismaClient({
-    adapter: new PrismaPg({ connectionString: getDatabaseUrl() }),
-  });
+let client: Client | undefined;
+
+function getClient(): Client {
+  if (!client) {
+    client =
+      globalForPrisma.prisma ??
+      new PrismaClient({
+        adapter: new PrismaPg({ connectionString: getDatabaseUrl() }),
+      });
+    if (process.env.NODE_ENV !== "production") {
+      globalForPrisma.prisma = client;
+    }
+  }
+  return client;
 }
 
-export const prisma = globalForPrisma.prisma ?? createPrismaClient();
-
-if (process.env.NODE_ENV !== "production") {
-  globalForPrisma.prisma = prisma;
-}
+/**
+ * Der Client wird erst beim ersten Zugriff erzeugt.
+ *
+ * Beim Produktionsbuild lädt Next.js die Routen-Module, um ihre Konfiguration
+ * einzusammeln. Zu diesem Zeitpunkt gibt es weder eine Datenbank noch eine
+ * DATABASE_URL — ein sofort verbindender Client würde den Build scheitern
+ * lassen.
+ */
+export const prisma: Client = new Proxy({} as Client, {
+  get(_target, property) {
+    const instance = getClient() as unknown as Record<string | symbol, unknown>;
+    const value = instance[property];
+    return typeof value === "function" ? value.bind(instance) : value;
+  },
+});
diff --git a/src/lib/qr/contrast.ts b/src/lib/qr/contrast.ts
index b18202e..28378fd 100644
--- a/src/lib/qr/contrast.ts
+++ b/src/lib/qr/contrast.ts
@@ -3,7 +3,7 @@
  *
  * Scanner erkennen einen Code über den Helligkeitsunterschied zwischen
  * Modul- und Hintergrundfarbe. Zu geringer Kontrast — und ebenso ein heller
- * Vordergrund auf dunklem Hintergrund („invertierter" Code) — führt bei
+ * Vordergrund auf dunklem Hintergrund („invertierter“ Code) — führt bei
  * vielen Kameras zu Lesefehlern.
  */
 
diff --git a/src/lib/qr/registry.ts b/src/lib/qr/registry.ts
index 9b39077..1ed785e 100644
--- a/src/lib/qr/registry.ts
+++ b/src/lib/qr/registry.ts
@@ -105,7 +105,7 @@ const MODULES: readonly QrTypeModule[] = [
 ];
 
 export const qrTypes: Record<QrTypeId, QrTypeModule> = Object.fromEntries(
-  MODULES.map((module) => [module.id, module]),
+  MODULES.map((qrType) => [qrType.id, qrType]),
 ) as Record<QrTypeId, QrTypeModule>;
 
 const missing = QR_TYPE_IDS.filter((id) => !qrTypes[id]);
@@ -122,8 +122,8 @@ export function getQrType(id: string): QrTypeModule | undefined {
 
 /** Liefert den Typ nur, wenn er in dieser Version nutzbar ist. */
 export function getActiveQrType(id: string): QrTypeModule | undefined {
-  const module = getQrType(id);
-  return module?.active ? module : undefined;
+  const qrType = getQrType(id);
+  return qrType?.active ? qrType : undefined;
 }
 
 export { QR_TYPE_IDS, isQrTypeId };
diff --git a/src/lib/qr/request.ts b/src/lib/qr/request.ts
index 673b5c7..9ed1b83 100644
--- a/src/lib/qr/request.ts
+++ b/src/lib/qr/request.ts
@@ -41,7 +41,7 @@ export class QrRequestError extends Error {
 }
 
 export type ResolvedQrRequest = {
-  module: QrTypeModule;
+  qrType: QrTypeModule;
   data: Record<string, unknown>;
   /** Der Text, der tatsächlich in den QR-Code kodiert wird. */
   content: string;
@@ -52,23 +52,23 @@ export type ResolvedQrRequest = {
  * bei statischen Codes die Nutzdaten selbst, bei dynamischen die Kurz-URL.
  */
 export function resolveQrRequest(request: QrRequest): ResolvedQrRequest {
-  const module = getActiveQrType(request.type);
-  if (!module) {
+  const qrType = getActiveQrType(request.type);
+  if (!qrType) {
     throw new QrRequestError(
       "Dieser QR-Typ ist in dieser Version noch nicht verfügbar.",
       404,
     );
   }
 
-  const validated = module.validate(request.data);
+  const validated = qrType.validate(request.data);
   if (!validated.ok) {
     throw new QrRequestError(validated.message);
   }
 
   if (request.mode === "dynamic") {
-    if (!module.supportsDynamic) {
+    if (!qrType.supportsDynamic) {
       throw new QrRequestError(
-        `Der QR-Typ „${module.title}" unterstützt keine dynamischen Codes.`,
+        `Der QR-Typ „${qrType.title}“ unterstützt keine dynamischen Codes.`,
       );
     }
     const slug = request.slug;
@@ -76,28 +76,28 @@ export function resolveQrRequest(request: QrRequest): ResolvedQrRequest {
       throw new QrRequestError("Ungültige Kurz-URL.");
     }
     return {
-      module,
+      qrType,
       data: validated.data,
       content: shortUrl(slug ?? PREVIEW_SLUG),
     };
   }
 
   return {
-    module,
+    qrType,
     data: validated.data,
-    content: module.encode(validated.data),
+    content: qrType.encode(validated.data),
   };
 }
 
 /** Dateiname für den Download, abgeleitet aus dem Inhalt des Codes. */
 export function downloadFilename(
-  module: QrTypeModule,
+  qrType: QrTypeModule,
   data: unknown,
   extension: string,
 ): string {
   let base = "qr-code";
   try {
-    const summary = module
+    const summary = qrType
       .summary(data)
       .toLowerCase()
       .replaceAll("ä", "ae")
diff --git a/src/lib/qr/type-module.ts b/src/lib/qr/type-module.ts
index bc0b25f..a76c7e1 100644
--- a/src/lib/qr/type-module.ts
+++ b/src/lib/qr/type-module.ts
@@ -5,7 +5,7 @@ import type { IconName } from "@/components/icons";
 /**
  * Alle QR-Typen, die die Anwendung kennt. V1 implementiert davon nur
  * "website"; die übrigen Einträge sind als Platzhalter registriert und
- * erscheinen in der Oberfläche mit dem Badge „Bald verfügbar".
+ * erscheinen in der Oberfläche mit dem Badge „Bald verfügbar“.
  */
 export const QR_TYPE_IDS = [
   "website",
@@ -148,7 +148,7 @@ export function defineComingSoonType(spec: {
 }): QrTypeModule {
   const notAvailable = (): never => {
     throw new QrTypeError(
-      `Der QR-Typ „${spec.title}" ist in dieser Version noch nicht verfügbar.`,
+      `Der QR-Typ „${spec.title}“ ist in dieser Version noch nicht verfügbar.`,
     );
   };
 
@@ -162,7 +162,7 @@ export function defineComingSoonType(spec: {
     defaultData: {},
     validate: () => ({
       ok: false,
-      message: `Der QR-Typ „${spec.title}" ist in dieser Version noch nicht verfügbar.`,
+      message: `Der QR-Typ „${spec.title}“ ist in dieser Version noch nicht verfügbar.`,
     }),
     encode: notAvailable,
     redirectTarget: notAvailable,